function selectCode(a)
{
  // Get ID of code block
  var e = a.parentNode.parentNode.parentNode.parentNode.getElementsByClassName('cont_code')[0];
 
  // Not IE
  if (window.getSelection)
  {
      var s = window.getSelection();
      // Safari
      if (s.setBaseAndExtent)
      {
        s.setBaseAndExtent(e, 0, e, e.innerText.length - 1);
      }
      // Firefox and Opera
      else
      {
        // workaround for bug # 42885
        if (window.opera && e.innerHTML.substring(e.innerHTML.length - 4) == '<BR>')
        {
            e.innerHTML = e.innerHTML + ' ';
        }
 
        var r = document.createRange();
        r.selectNodeContents(e);
        s.removeAllRanges();
        s.addRange(r);
      }
  }
  // Some older browsers
  else if (document.getSelection)
  {
      var s = document.getSelection();
      var r = document.createRange();
      r.selectNodeContents(e);
      s.removeAllRanges();
      s.addRange(r);
  }
  // IE
  else if (document.selection)
  {
      var r = document.body.createTextRange();
      r.moveToElementText(e);
      r.select();
  }
}
if(text){}else{ var text = 'Selecionar todos';}
jQuery(document).ready(function(){
  jQuery("div.postbody span.genmed:contains('Code')").html('Code: <a href="#" onclick="selectCode(this); return false;" class="code-a" title="Chọn tất cả nội dung code" >Chọn Tất Cả</a>');
});